Effects of Multiple Modifiers on Adhesive and Self-Healing Properties of Asphalt Based on Bitumen Bond Strength Test

Abstract:

Adhesive and self-healing properties are two inherent properties that should be considered when evaluating the durability of asphalt materials. In this paper， the binder bond strength （BBS） test is applied to evaluate the effects of five representative modifiers at varying dosages on the adhesive and self-healing properties of asphalt. Moreover， the four-point beam （4PB） fatigue test with a healing interval period is conducted and correlated with BBS testing results. It is found that linear SBS， high-density polyethylene （HDPE） and rubber all have negative effects on the asphalt adhesive strength while only gilsonite can enhance the adhesive property. HDPE， rubber and gilsonite at lower dosages （≤12.0%） can improve the asphalt self-healing property. In addition， the strong correlation of the healing performance between binder and mixture is found， verifying the accuracy of the BBS test in evaluating the healing performance of asphalt materials.

Key words:asphalt;adhesive property;self-healing property;modifiers;binder bond strength test;four-point beam fatigue-healing test